Shingle machine spur roll ratchet



Y A.. umm.: s'HINGLE 'MACHINE sPu nou.y aucun.

l vAPPLGA'I'ION FILED APR. 8. |922.

f Pantedsepn Patented Sept. 5, 1922..

ii irsN AUGUST G. DEHLIN, or OLYMPIA, WASHINGTON, assrefivoie` or owne-Terran yro ELLIN n NELSON, or OLYMPIA, WAsIIINGTonU SHINGLE MACHINE srunnoIQL` Rainer-Ism; ifi" j i Application filed April 8, 192.2. Serial No. ,550,754. v

To all whom it may concern: A I l Be it known that I, AUGUST Gr. DEHLIN, a citizen of the United States, and a resident of Olympia, in the county of Thurston, State of Washington, have invented certain new and useful Improvements .in Shingle 'Machine Spur Roll Ratchets, of which the following is a specification.

'Ihis invention relates to the -mechanism by which the block, from which shingles are being cut, is automatically fed forward after each shingle has been out therefrom in order to bring the block in line 4with the saw so that another shingle will be cut therefrom. The invention relates to that part of said mechanism wherein a reciprocating or oscillatory movement is transformed into an intermittent forward motion.

The objects ofmy invention are to provide a ratchet which will be simple and rugged in construction; which will be positive in action; which will have substantially no backlash; which will be very sensitive to a small movement; and whereby the desired thickness ofthe shingle may be accurately obtained. j

I attain these and other objects by the devices, mechanisms, and `arrangementsillustrated in the accompanying drawings, in which' v Fig. lis

aV perspective view of my improved ratchet mountedl in a spur` roll feed mechanism; v j

Fig. 2 is a side elevation, withthe cap removed", showing the ratchet in the feeding position; j n y Fig. 3 is l a similarv view showing the ratchet in released position; and

Fig. 4 is a section of my invention on the line 4 4 in Fig. 2. 4

Similar numerals of reference refer to similar parts throughout the several views.

In shingle machines the block of wood from which the shingles are being out is firmly clamped between two spur rolls, one above and the other below the block, which are mounted on a reciprocating carriage.

' This carriage moves on tracks, by which it is guided, and draws the block past a circular saw, rotating in a vertical plane parallel to the motion of the carriage. The saw thus outs a slice 0E the block, as the carriage advances, and then the carriage moves back a suflicient distance so that the block is entirely free from engagement with the saw.

important.

".Asjtheiend of this returning stroke is approached the roller vl (Fig.,V l), on, the end of the arm'2 of the `bell-crank lever, engages an inclined plane 3 land rolls up it, thus turning thel bell-crank lever on its pivot and moving theother arm 4 thereof.,` The plane 3` is'itself automatically adjustable, by mechanism not shown, lso vthat the yamount of mof tionofthe arm 4 is controlled, and thisis` `-usuallyso arrangedthat every alternate time f..

that they roller l engages the 4plane 3 the said vmotion is very.4 .slight. When; the y carriage starts forward again the roller l passes down the plane' 3 and) the arm 4 is ymoved back into its original position;` The result is therefore `anoscillatory motion of thebellcrank lever. The ratchet isset tooperate .the spur roll whenfthe roller l is passing up,l the inclined plane 3. Asabove stated, there Lare two spur rollsl and each isoperated by t separate, though. similar, mechanismy and each plane is independently controlled. The j planes .are controlled in such a way that when the top spur roll feeds the upper end of the block a short distance the lower spur j roll will feedthe lower, endfa longer distance,

and vice versa, thus tilting the block to make the saw'I cuta'jshingleof wedge-shaped section. It is evidentthat if vt-hevthin edge of theshingle. is ,normally quite thin-then a verysmall kdelay in action of its feed .will resultfin its being too thin for'.` practical use (while it would not makei any substantial difference atthe thick end of theshingle) and it is for this reason that-the quick laction andfine adjustment :of the ratchet is Injthe drawings I havesomewhat exaggerated' the motion Iof the ratchet worm in order to make -it, `c learbut it is to be understood thatactually it is only `suflicient vtorv enable the' complementary .teeth vto clear each other.; s' 4 u The yspur ro'll ofthe drawings maybe either the upper orthe lower roll on the carriage. A worm wheel 6 is rigidly secured on the end of the roll 5. A casing 7, preferf ably split in two sections as shown, is loosely mounted on the end of the roll 5 andencloses the wheel '6 and the ratchet mechanism, to prevent dust from interfering with the free action of the ratchet. The casing 7 has a lug 8 extending therefrom. A link 9 connects the lug 8 with the above describedarm 4 of the bell-crank lever. It will-there 4 fore be understood that the casing l7 has an' oscillatory motion corresponding with that of the said arm 4. A shaft or pin- 10 is secured within the casing 7 and a disk 11 is also secured at one end thereof. The flat surface of the disk 11 is serrated by suitable sharp ratchet teeth 12. The pin 10 and disk 11 are fixed within the casing and move only therewith.

A worm 13 is loosely mounted on the pin lO and engages the wheel 6. The worm 13 is free to rotate on the pin 10 and to slide there'along to a limited extent. An extension druI-n 114: ofv the worm 13 is provided with ratchet teeth 15 on its cylindrical surface and with ratchet teeth 16 on its fiat end, said teeth 16 bein-g complementary to the teeth 12 on the fixeddisk- 11. T he worin slidesv on the pin a su'liic'ient extent to bring said teeth 16 into or out of engagement with theteeth 12. A pawl; 17 is vpiv'oted to the casing 7 and' is kept in conta-ct with the drum 141 by mea-ns of the spring 18, of any desiredy form. l prefer to arrange the paw'l so that it engages one of the teeth 1 5 when the worm has turnedl to such position that the teeth 16 do not immediately engage` the teeth 12. rThe teeth- 1-5 are broadened-gh to permit the drum to slide under the pawl without being disengaged therewith.

It is apparent then 4tha-t if the link 9 is actuated so as to turn the casing 7 .on the roll 5 in the direction shown in Fig. 3, the action of the worm wheel 6 willl move the worin 13 on the pin 10 sok as to disengage the teeth 1-6 from the teeth 12y and will simultaneously causek the worm to rotate on the pin in the direction of the arrow thereon, scthat neither the pawl 17 nor the disk 11 interfere with its reerotation and Atherefore the rolll 5`is Ynot tiirned backward; but,V the moment the direction ot motion of the link 9 is changed to that shown in Fig. 2, the action of the Wheel 6 on the worm 13 moves the worm on thepin 10 and simultaneously tries to turn the worin on the pin in a direction .opposite y,to that shown in Fig. 3. The result is that either the pawl 17 engages one of the teeth 15,

or vthe teeth 16 mesh with the teeth 12 of the xed disk, and therefore the said worm 'is preventedv from'further turning on the pin, and the wormwheel 6 is locked to the casing 7. Hence when the link 9 moves as in Fig. 2, the roll 5 turns forwardvr with it substantially without backlash or delay. The sensitiveness or' this ratchet is attained by the tact-that the worm 13 turns on the pin. 10 at a much higher rate than the casing turns on the roll 5 and, in fact, this spur rol-l1; an actuated casing loosely mounted on said spur roll; a worin wheel fixed to said spur rollI and within said' casing; a worin mounted in said casing and in constant engagement with said worm wheel; and means permitting said worin to freely turn inthe casing in one direction but pre Venting' it from `turning in the opposite di rection, whereby the worm wheel is locked in the casing and the spur roll isturned by the casing.

2. 1n apparatus as set forth in claim 1; wherein the worin isp'ermitted axial movement; and a fixed means to prevent said worm from turning inthe casing when 'the worm has been moved into contact therewith.

3.l In apparatus as set forth in claim 2; said iixed means comprising a fiat toothed surface; and said worm having a complemontary flat toothed surface onits end,lsaid axial.' movei'nent of the worin being suiii'cient to bring' said toothed surfaces into or out oit engagement'.

4L; In apparatus as set forth in claim 3; ratchet teeth formed on an extension ci the worm; a spring actuated pawl mounted in the casing and'engaging said toothed extension in all axial positions of the worm.

5, 1n apparatus as set forth in claim 1;

nuensr e. Darius. 

